instrumentation design

  • 文章类型: Journal Article
    未来的空域预计将变得更加拥挤,额外的服务货运和商业航班。在这样的环境下,飞行员将面临额外的负担,鉴于他们在完成工作活动时必须同时考虑的因素越来越多。因此,必须注意和注意操作飞行员所经历的心理工作量(MWL)。如果没有地址,精神超负荷状态可能会影响飞行员以安全和正确的方式完成其工作活动的能力。本研究检查了两种不同的驾驶舱显示接口(CDI)的影响,蒸汽量规面板和G1000玻璃面板,在基于飞行模拟器的环境中,新手飞行员的MWL和态势感知(SA)。在这项研究中,使用客观(EEG和HRV)和主观(NASA-TLX)评估的组合来评估新手飞行员的认知状态。我们的结果表明,CDI的量规设计会影响新手飞行员的SA和MWL,与G1000玻璃面板更有效地降低MWL和改善SA相比,蒸汽量规面板。这项研究的结果对未来飞行甲板接口的设计和未来飞行员的培训具有重要意义。
    Future airspace is expected to become more congested with additional in-service cargo and commercial flights. Pilots will face additional burdens in such an environment, given the increasing number of factors that they must simultaneously consider while completing their work activities. Therefore, care and attention must be paid to the mental workload (MWL) experienced by operating pilots. If left unaddressed, a state of mental overload could affect the pilot\'s ability to complete his or her work activities in a safe and correct manner. This study examines the impact of two different cockpit display interfaces (CDIs), the Steam Gauge panel and the G1000 Glass panel, on novice pilots\' MWL and situational awareness (SA) in a flight simulator-based setting. A combination of objective (EEG and HRV) and subjective (NASA-TLX) assessments is used to assess novice pilots\' cognitive states during this study. Our results indicate that the gauge design of the CDI affects novice pilots\' SA and MWL, with the G1000 Glass panel being more effective in reducing the MWL and improving SA compared with the Steam Gauge panel. The results of this study have implications for the design of future flight deck interfaces and the training of future pilots.
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  • 文章类型: Journal Article
    总的来说,软组织的电特性对施加到其表面的力敏感。为了进一步研究力与软组织电特性之间的关系,本文试图研究静态和高阶应力对电性能的影响。总的来说,设计了一个实用的实验平台来获取接触过程中软组织的力信息和电特性,具有不同的压缩刺激,例如恒定的压力,恒定的压制速度,和步进力压缩,等。此外,创新性地引入压阻特性对软组织的机电特性进行建模。采用有限元建模(FEM)来拟合软组织的静态压阻。最后,进行了实验研究,以证明应力对电特性的影响以及所提出的压阻模型描述软组织的机械和电特性的可行性。
    In general, the electrical property of soft tissues is sensitive to the force applied to their surface. To further study the relationship between the force and the electrical property of soft tissues, this paper attempts to investigate the effect of static and higher-order stresses on electrical properties. Overall, a practical experimental platform is designed to acquire the force information and the electrical property of soft tissues during a contact procedure, which is featured different compression stimuli, such as constant pressing force, constant pressing speed, and step-force compression, etc. Furthermore, the piezoresistive characteristic is innovatively introduced to model the mechanical-electrical properties of soft tissue. Finite Element Modeling (FEM) is adopted to fit the static piezoresistivity of the soft tissue. Finally, experimental studies were performed to demonstrate the effect of stress on the electrical properties and the feasibility of the proposed piezoresistive model to describe soft tissues\' mechanical and electrical properties.
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  • 文章类型: Journal Article
    在环境条件下进行的基于悬臂的原子力显微镜(AFM)已成为表征新材料系统和设备的重要工具。当前的仪器允许在大面积上进行强大的扫描,原子尺度横向分辨率,以及使用多频和多模态AFM操作模式对各种样品属性的表征。新型量子材料和器件的研究,然而,通常需要低温和超高真空(UHV)条件,更具体地说,AFM仪器提供原子分辨率。为此,基于音叉力传感器的AFM仪器变得越来越流行。与微制造悬臂相比,更宏观的音叉,然而,缺乏敏感性,这限制了测量带宽。此外,多模态和多频率技术,例如在环境条件下进行的基于悬臂的AFM中可用的那些,很难实施。在这篇文章中,我们描述了基于悬臂的低温UHVAFM设置,该设置允许将针对环境条件开发的通用AFM技术转移到UHV和低温条件。我们证明了这种基于悬臂的AFM通过允许具有优越的力导数灵敏度和带宽的多模态或多频率操作来提供实验灵活性。我们的仪器具有亚皮米间隙稳定性,不仅可以同时绘制具有原子尺度分辨率的垂直和横向力,但也执行快速概述扫描与尖端保持在更大的尖端样品距离的强大的成像。
    Cantilever-based atomic force microscopy (AFM) performed under ambient conditions has become an important tool to characterize new material systems as well as devices. Current instruments permit robust scanning over large areas, atomic-scale lateral resolution, and the characterization of various sample properties using multifrequency and multimodal AFM operation modes. Research of new quantum materials and devices, however, often requires low temperatures and ultrahigh vacuum (UHV) conditions and, more specifically, AFM instrumentation providing atomic resolution. For this, AFM instrumentation based on a tuning fork force sensor became increasingly popular. In comparison to microfabricated cantilevers, the more macroscopic tuning forks, however, lack sensitivity, which limits the measurement bandwidth. Moreover, multimodal and multifrequency techniques, such as those available in cantilever-based AFM carried out under ambient conditions, are challenging to implement. In this article, we describe a cantilever-based low-temperature UHV AFM setup that allows one to transfer the versatile AFM techniques developed for ambient conditions to UHV and low-temperature conditions. We demonstrate that such a cantilever-based AFM offers experimental flexibility by permitting multimodal or multifrequency operations with superior force derivative sensitivities and bandwidths. Our instrument has a sub-picometer gap stability and can simultaneously map not only vertical and lateral forces with atomic-scale resolution, but also perform rapid overview scans with the tip kept at larger tip-sample distances for robust imaging.
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